I have just discovered John G Rives - a very clever, very funny performance poet.
Rives is a performer, a storyteller and an author. He has appeared on multiple seasons of HBO's Def Poetry Jam and was a member of the Def Poetry international tour group. He has made multiple appearances at the international thinkers TED Conference and has published several pop-up books for children.
Here's his rap on YouTube about Deaf Poetry:
Here's his "Mockingbird" remix of the 2006 TED conference
Here's his rap on TED.com on the conspiracy theory of Four In The Morning:
And a cerebral poem interpreting emoticons...